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Many nitrate test kits are prone to amine interference. This can give results much lower than actual. The Salifert nitrate test does not suffer from such an amine interference. The very special ingredients allow a very fast and precise measurement. The range spans from very low to a very high nitrate concentration (approx. 0.05 – 20 mg/L as Nitrate-Nitrogen or 0.2 – 100 mg/L as nitrate ion). The kit can perform approx. 60 measurements

AS with all of Salifert's test kits, this is a very high quality test kit. If you have a reef tank. You will certainly benefit form this test kit. Although it is really costly, you get what you pay for !